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The West Lake, a famous scenic spot for tourists in China, is a small shallow eutrophic lake. However, the lake has been suffering from eutrophication from year to year and its beauty is marred by low transparency of the water. To control its eutrophication, a great deal funds had been invested and some projects had been organized by the government in the past twenty years. The effects of these projects were not satisfactory and the eutrophication is still progressing. Thus, the average depth 0.5m of silt on the bottom of the West Lake was dredged largely from 1999 to 2002. During the Jan. 1999 to Dec. 2000, the N and P of the sediment and water quality were surveyed, the phytoplankton, zooplankton and benthos communities (including species composition and density biomass) were investigated in the West Lake. To compare the investigated result with previous results and data (before the dredging), the succession of the communities was discussed. Further, the ecological effect of the dredging and the present trophic state of the lake were evaluated. The results showed that the N and P content in the sediment were decreased after the dredge, the water quality had been improved obviously, and the density in the phytoplankton community and the chlorophyll-a concentrations had decreased obviously comparing those in 1999, and the trophic level also had decreased in main lake areas.

Ecological effects of the dredging in the West Lake,Hangzhou